Merge pull request #72 from mruby/dependabot/bundler/nokogiri-1.10.8

Bump nokogiri from 1.10.4 to 1.10.8

Author: matz

Gemfile.lock

@@ -208,7 +208,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.11.3)
     multipart-post (2.1.1)
-    nokogiri (1.10.4)
+    nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)